Stirring device for mechanical roasting-furnaces.



Patented June 20, 1916.

THB COLUMBIA PLANnuRAPH c6., WASHINGIDNuDJ.

llNllT@ JOSEF CLAUDE, OF FRANKFORT-NTHE BANK UND METALLURIGISOHEGESELLSCHAFT GEB/MANY, A. CGBIPGRATION.

MAIN, GERMANY, ASSIGNOR T0 METALL- Specification of Letters Patent.

Patented June 2Q, i916.

Application filed April 16. 1915. Serial No. 21,932.

To (ZZZ whom 'it may concern:

Be it known that I, Josnr CLAUDE, metallurgical engineer, a subject ofthe Einper r of Germany, and residing at Frankfort-onthe Main, Germany,have invented certain new and useful improvements in Stirling .Devices`for Mechanical Roasting-Furnaces,

of which the following is a specification.

The invention relates to improved means for fastening` the rabble armson the shaft of mechanical furnaces for roasting` or ctherwise treatingores and other material. in this new fastening device the parts servingfor the fastening' of the rabble arms are located within the cooledshaft or the cooled hollow arm body, from the heat as well as thechemical aotion of the material under treatment and the roasting gases.This will have for ef feet to secure greater consistency of theconnecting members and in case of rupture of the arm prevent them frombeing distorted, and to enable easy and quick removal of said connectionmembers and the arm body from the shaft. Said connection members are ofhollow shape and of such dimensions that they can be traversedthemselves by the cooling medium, and to render them resistant and ofeasy access.

The invention is shown in the drawing `given by way of example.

o. is a part of the shaft, in section, with cylindrical recesses forreceiving the ends of the rabble arms. The shaft is provided with a centyal channel e, and channels Z separated therefrom. At the rear end ofthe recess Z) therer is in the shaft a circular perforation e which isthreaded at the inside. A hollow bolt 7 is screwed into this perforatione, the hollowina)` being of angular section so that the bolt may beturned by means of a key. It bears with its tie g against an abutment ofthe shaft-wall. Also the front end of the hollow bolt is threaded at theoutside. nto the cylindrical recess b of the shaft the end of the rabblearm Zt is inserted about the hollow bolt.

Through the front open end of the rabble so as to guard them' Atude ofthe screwed parts arm a hollow square nut 'L' is introduced andtightened upon the bolt Zrith its rear end the nut-screw t' bearsagainst the annular projection Ze inside the rabble arm, thus pressing,when the screw is tightened, the rabble arm into its seat. A pipe Z isinserted into the hollow front end of the nut and the front end of therabble arm is closed by means of a cover m.

The rabble arm is cooled for instance by means of air, which isadmittechtogether for the several arms, to the central channel c of theshaft, from which it passes through the hollow bolt f' and the hollownut Z to the pipe. From pipe Z the air flows to the interior of therabble arm from which it escapes through the opening; a which is incommunication with a corresponding` openingy 0 in the wall of the recessin the shaft. Through this opening the air is introduced to the channelsZ of the shaft and escapes at the bottom or the top.

The advantage of the arrangement as described is, on the one hand, itssimplicity,

cumbersome casting-molds can be dispensed with; on the other hand, theampliallows easier access and hence repair in case of rupture of thearms. VJ hen an arm is broken, the pipe Z is removed, the nut Z, screwedoff and the end of the rabble arm pulled out. this be dillicult, thenthe hollow bolt f is screwed olf, the tie g of which in being loosenedis pressing' against the annular' flange `/f: of the rabble arm, thusforcing' out the end sticking' fast.

`What l claim is:

'in a stirring device for mechanical roasting furnaces for ores andother material, a shaft with recesses for the rabble arms, a hollowrabble arm, one of the ends of which is shaped so as to fit in a recessof the shaft, av hollow bolt, fastened in the rear wall of theshaft-recess, the interior of the bolt beina in communication with acentral channel of the shaft, a hollow nut which is open at the frontand which is screwed upon the front end of the hollow bolt, thuspressing Should In testimony whereof I aiiix my signature 1n presence oftwo witnesses.

Y JOSEF CLAUDE.

against an abutment in the interior of the hollow krabble arm, andpressing it against its seat in the shaft, a Cooling pipe fitting in thehollow nut, so as to enable the cooling Witnesses:

medium to pass from the shaft through the i 1 hollow bolt, the hollownut and the cooling JEAN GRUND, pipe into the inside of the rabble arm.CARL GRUND.

Copies 'of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

n Washngton,ID. C.

